Linear Rule

Linear Rule

Expression that defines a relationship of direct variation.

relationship of direct variation is defined by a rule in the form y = kx where k is a constant.


This graph illustrates the function f defined by f(x) = –2x. In this case, the constant k is –2.

We can also represent a linear relationship using a table of values:

x -5 -2 0 1 3
f(x) 10 4 0 -2 -6

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